During March 2026, Vincent Beffara contributed to the leanprover-community/mathlib4 repository by generalizing the SimpleGraph.map function within the combinatorics module. He extended this function to accept arbitrary mappings, enabling more flexible graph contractions and broader reuse of map-based patterns in graph theory. To ensure correctness, Vincent updated dependent theorems to handle injectivity constraints, thereby improving the robustness of contraction workflows. His work, implemented in Lean and grounded in combinatorial mathematics and functional programming, enhanced the library’s ability to model complex combinatorial structures. The focus was on feature expansion, code health, and clear documentation, with no critical bugs reported.